The present invention relates to a multi-stage Stirling cycle machine and a steady-state operating parameter control method therefor. In the Stirling cycle machine, a mechanical energy input piston, a mechanical energy transfer double-acting free piston and a mechanical energy output piston constitute a plurality of Stirling working units which are arranged in stages. The mechanical energy input piston is connected to a mechanical energy input apparatus, and the mechanical energy output piston is connected to a mechanical energy output apparatus. When the Stirling cycle machine in the present invention is used as an engine, a relatively small amount of mechanical energy is input into a mechanical energy input piston in a set of pistons, the mechanical energy is amplified by a multi-stage Stirling unit, and a relatively large amount of mechanical energy is then output by a mechanical energy output piston. In the present invention, the required piston motion mode is realized by means of parameter calculation, selection and design, such that the multi-stage Stirling cycle machine can adapt to changes in an input condition and adjust an output power as required. The device in the present invention has a simple structure, a good adjustment performance, a small mechanical loss and a small deadvolume, is suitable for use with a large-diameter piston, and can be widely applied to waste heat power generation and distributed energy and renewable energy power generation.

A multi-stage Stirling cycle machine and a steady-state operating parameter control method therefor are disclosed. In the Stirling cycle machine, a mechanical energy input piston, a mechanical energy transfer double-acting free piston, and a mechanical energy output piston constitute a plurality of Stirling working units which are arranged in stages. The mechanical energy input piston is connected to a mechanical energy input apparatus. The mechanical energy output piston is connected to a mechanical energy output apparatus. When the Stirling cycle machine is used as an engine, a relatively small amount of mechanical energy is input into a mechanical energy input piston in a set of pistons, the mechanical energy is amplified by a multi-stage Stirling unit, and a relatively large amount of mechanical energy is then output by a mechanical energy output piston.